﴿ وَٱتْرُكِ ٱلْبَحْرَ رَهْوًا ۖ إِنَّهُمْ جُندٌۭ مُّغْرَقُونَ ﴾

“and leave the sea becalmed [between thee and Pharaoh’s men]: for, verily, they are a host destined to be drowned!””

And leave the sea behind once you and your companions have crossed it at rest still and calm until the Egyptians enter it indeed they will be a drowned host’ — he Moses was reassured by this statement — and they were indeed drowned.